package IO;

import jdk.jshell.spi.SPIResolutionException;

import java.io.*;
import java.util.Scanner;

public class IO19 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要搜索的路径:");
        String rootPath = scanner.next();
        File rootFile = new File(rootPath);
        if(!rootFile.isDirectory()){
            System.out.println("要搜索的路径有误!");
            return;
        }
        System.out.println("请输入要从搜索的查询词:");
        String key = scanner.next();
        //进行递归
        scan(rootFile,key);
    }
    private static void scan(File rootFile,String key){
        if(!rootFile.isDirectory()){
            return;
        }
        File[] files = rootFile.listFiles();
        if(files==null||files.length==0){
            return;
        }
        for(File f:files){
            if(f.isFile()){
                doSearch(f,key);
            }else {
                scan(f,key);
            }
        }
    }
    private static void doSearch(File f,String key){
        //打开文件,读取文件内容,判定文件内容是否包含 key
        StringBuilder sb = new StringBuilder();
        try(Reader reader =new FileReader(f)){
            char[]  buffer = new char[1024];
            while(true){
                int n  = reader.read(buffer);
                if(n==-1){
                    break;
                }
                String s = new String(buffer,0,n);
                sb.append(s);
            }
        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        if(sb.indexOf(key)==-1){
            //未找到
            return;
        }
        System.out.println("找到匹配的文件" + f.getAbsolutePath());
    }
}
